Improvement in the durability of Pt electrocatalysts by coverage with silica layers

Sakae Takenaka, Hiroshi Matsumori, Keizo Nakagawa, Hideki Matsune, Eishi Tanabe, Masahiro Kishida

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99 Citations (Scopus)


Carbon nanotube (CNT)-supported Pt metal nanoparticles were covered with silica layers by utilizing the successive hydrolysis of 3-aminopropyl- triethoxysilane and tetraethoxysilane on CNTs with Pt hydroxide. The CNT-supported Pt metal particles covered with silica layers (denoted as SiO 2/Pt/CNT) were used as the electrocatalysts. SiO2/Pt/CNT electrocatalysts showed a high stability for the repeated potential cycling experiment, whereas Pt/CNT electrocatalysts were deactivated seriously for the experiment because of the growth of Pt metal particles in size. The silica layers in SiO2/Pt/CNT prevent the dissolution of Pt metal particles as well as the migration and agglomeration of Pt metal particles on the supports, which results in the improvement of the stability of Pt/CNT electrocatalysts.

Original languageEnglish
Pages (from-to)15133-15136
Number of pages4
JournalJournal of Physical Chemistry C
Issue number42
Publication statusPublished - Oct 25 2007

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films


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